Ford commercial
I actually got kind of excited when I saw the blatant Ford product placement at the beginning. It tells me that this episode was more expensive to produce than others, which most likely means it will have some pretty awesome effects.

Explanation
Didn't Bell say his first thought was that the blast from the bomb was powerful enough to break Dana's atoms apart? The "destiny" thing seemed like more of an afterthought or random musing to me.

This soul magnet thing has actually been set up for a while.
Walter said that it would be easy to insert a soul magnet into a person: an injection, a cup of tea, etc. When Olivia meets with Bell in the other universe in the Twin Towers (beginning of Season 2), he gives her a cup of tea, and immediately after he rings…

I think some people are misunderstanding.
They're not saying that EVERY vortex that happens in the other universe is caused by this emotional quantum entanglement. It's just that the couple happened to live on a soft spot, and their inability to let each othe go was making that one soft spot worse, which is why it…

Who said the coinflip had the opposite result? Maybe they just called a different side over there.

Remember this?
"Even condoms are not always one hundred percent effective. You two should be aware of this."
-Walter to Peter and Olivia in Season 1, Episode 2